Mod education are provided best solution for CBSE RBSE NCERT Class 10 Science Chapter 14 Sources of Energy Best Notes Solutions, Video Classes, Live Problem Classes, Worksheet, Test Exam Paper and MCQs
|Board||CBSE / RBSE / Other state Board|
|Name of Chapter||Sources of Energy|
NCERT Solution for Class 10 Science Chapter 14 Sources of Energy
What is a good source of energy?
A good source of energy is one that
does a large amount of work per unit volume or mass
can be easily accessible
is easy to store and transport, and
What is a good fuel ?
A good fuel is one which has the following properties :
It should be fairly cheap.
It should be easily available.
Its ignition temperature should be well above normal temperature.
It should be conveniently handled and transported.
It should not produce any poisonous material during burning.
Its combustion rate should be steady and controllable.
It should not leave any residue or ash after burning.
A good fuel should have high calorific value so that higher amount of heat may be obtained by burning a little fuel.
What are the disadvantages of fossil fuels ?
(i) The burning of fossil fuels produces large amount of carbon dioxide that causes increased greenhouse effect.
(ii) The burning of fossil fuels (such as coal) produces smoke which pollutes the air.
(iii) The burning of fossil fuels produces acidic gases such as sulphur dioxide and nitrogen oxide. These acidic gases cause acid rain that affects our water and soil resources.
(iv) Fossil fuels cannot be replenished in short time because it takes millions of years to form them.
Why are we looking at alternate sources of energy ?
We are looking at alternate sources of energy because of the following reasons.
The fossil fuels and nuclear fuels on the earth are limited which may not last for long.
The undesirable effects of pollution, both from the burning of fossil fuels and from the radioactive nuclear wastes of nuclear power plants are creating threat to our environment.
How has the traditional use of wind and water energy been modified for convenience ?
(i) Wind mill farms are constructed to produce electricity.
(ii) The traditional use of energy of flowing water has been modified by establishing hydro-power plants. At hydro-power plants, the energy of falling water or flowing water is tapped by using a water turbine and then made to drive generators.